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Table Of Contents
If you play back the project before the analysis is complete, the clip will appear as if
Frame Blending is set to None. When the analysis is complete, the indicator disappears,
and the clip will play back properly. You can view more detailed information about the
clip analysis and stop the process before it is finished.
You can perform optical flow analysis on multiple clips simultaneously. The clips are
processed in the order—the first clip you apply optical flow to is processed first, and
so on.
Note: The more motion contained in a clip, the longer the analysis takes.
For information on pausing, reordering, or stopping a clip analysis, see Displaying and
Editing Retiming Tasks.
Important: When importing interlaced footage and using the Optical Flow method for
frame blending, be sure the Field Order parameter (in the Media Inspector) is assigned
to the correct value. Otherwise, artifacts might appear in the retimed layer.
End Condition: A pop-up menu that lets you set how playback continues when the end
of the clip is reached. There are four options:
None: The default setting. The layer’s duration in your project is equal to the duration
of its source media file.
Loop: When the last frame of the clip is reached, the clip loops back to the first frame
and plays again. This can cause a jump in the clip’s apparent playback unless the clip
was designed to loop seamlessly.
Ping-Pong: When the last frame of the clip is reached, the next iteration of clip playback
is reversed. If you set a clip of a ball rolling on the floor to loop with the Ping-Pong
option, it would appear to roll forward, then backward, then forward again for the
duration of the layer. The Ping-Pong option lets you extend the duration of some video
clips more smoothly than the Loop option.
Hold: This freezes the last frame of the clip for the amount set in the End Duration
slider.
Note: When using the Hold option with interlaced footage, ensure that field order is
properly set in the Media Inspector. To modify a clips field order, select the clip in the
Media list, then choose an option from the Field Order pop-up menu in the Media
Inspector.
End Duration: A slider that lets you set the number of frames by which the clip is extended
at the end of its duration. This value can be adjusted only if End Condition is set to a value
other than None.
Displaying and Editing Retiming Tasks
You can display processing information when retiming a clip.
315Chapter 7 Basic Compositing